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Method for manufacturing lithium secondary battery with improved high-temperature storage properties

A lithium secondary battery, battery technology, applied in the direction of secondary battery, secondary battery manufacturing, secondary battery repair/maintenance, etc. Effects of suppressing oxidation side reactions, improving high-temperature storage safety and cycle life characteristics

Active Publication Date: 2019-08-13
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in order to manufacture a lithium secondary battery with high energy density, the secondary battery needs to be driven at high temperature and high voltage, and in this case, the oxidation reaction between the electrolyte and the positive electrode may cause gas generation during high-temperature storage increase and deterioration of lifetime characteristics

Method used

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  • Method for manufacturing lithium secondary battery with improved high-temperature storage properties
  • Method for manufacturing lithium secondary battery with improved high-temperature storage properties

Examples

Experimental program
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Effect test

Embodiment 1

[0100] (Preparation of non-aqueous electrolyte)

[0101] A nonaqueous electrolyte was prepared by adding 5 g of 1,2,3-trifluorobenzene, 1 g of vinylene carbonate (VC), and 3 g of 1,3-propane sultone to 91 g of a mixed solvent prepared by 1.0M LiPF 6 Prepared by mixing with an organic solvent having a composition of ethylene carbonate (EC):propylene carbonate (PC):propyl propionate (PP)=3:1:6 (weight ratio).

[0102] (production of positive electrode)

[0103]Based on 100 parts by weight of N-methyl-2-pyrrolidone (NMP) as a solvent, add 70 parts by weight of solids to prepare positive electrode active material slurry, which is positive electrode active material (lithium cobalt oxide ( LiCoO 2 )): conductive material (bundle-type carbon nanotube (manufactured by LG Chem., number: B.CNT): binder (polyvinylidene fluoride (PVDF)) mixed at a weight ratio of 97.7:0.3:2 The positive electrode active material slurry was applied to a positive electrode current collector (Al thin fil...

Embodiment 2

[0110] A non-aqueous electrolyte and a lithium secondary battery including the non-aqueous electrolyte were manufactured in the same manner as in Example 1, except that: in the preparation of the non-aqueous electrolyte in Example 1, 95 g of the mixed solvent included 1 g of 1,2,3-trifluorobenzene.

Embodiment 3

[0112] A lithium secondary battery including the non-aqueous electrolyte was manufactured in the same manner as in Example 1, except that when manufacturing the secondary battery of Example 1, at 5 kgf / cm 2 The formation process is carried out under pressure conditions.

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Abstract

The present invention relates to a method for manufacturing a lithium secondary battery, the method comprising the steps of: preparing a lithium secondary battery including an electrode assembly, a non-aqueous electrolyte for impregnating the electrode assembly, and a battery case for housing the electrode assembly and the non-aqueous electrolyte; formulating the lithium secondary battery; and carrying out a degassing process to remove gases generated from the inside of the lithium secondary battery, wherein the non-aqueous electrolyte comprises a lithium salt, an organic solvent, and 1,2,3-trifluorobenzene as an additive, the 1,2,3-trifluorobenzene being contained in an amount of 0.1-10% by weight on the basis of the total weight of the non-aqueous electrolyte, and wherein the formulatingstep includes charging the battery to a state of charge (SOC) of 10-80% while applying a voltage of 3.5-4.5 V under a pressure of 0.5-5 kgf / cm<2> at a temperature of 45-80 DEG C.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2017-0015751 filed at the Korean Intellectual Property Office on February 3, 2017 and Korean Patent Application No. 10-2018- filed at the Korean Intellectual Property Office on February 1, 2018 0012788, the disclosure of the above-mentioned patent application is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a method for manufacturing a lithium secondary battery having improved high-temperature storage characteristics. Background technique [0004] As technology development and demand for mobile devices increase, demand for secondary batteries as energy sources is rapidly increasing. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage have been commercialized and widely used. [0005] Lithium secondary batteries are generally p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/0567H01M10/42H01M10/44H01M10/052
CPCH01M10/0567H01M10/0525H01M10/049Y02E60/10Y02P70/50H01M10/4235H01M10/446H01M10/052H01M10/44H01M2220/20H01M10/04H01M10/42Y02T10/70
Inventor 李政旻林永敏李哲行安俞贺郑理珍吴娫綕
Owner LG ENERGY SOLUTION LTD
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